Follow the Champions League LIVE
19:27 CET - After a difficult start, Arsenal have begun taking control of possession against Athletic Club in the last 15 minutes.
Opta insight: Arsenal have had 71.9% possession over the last 15 minutes.
19:02 CET - Athletic Club are on top against Arsenal in the early stages, with the hosts dominating possession and looking a threat. The visitors haven't got going in this contest so far.
18:55 CET - In the other early kick-off, Royale Union SG have scored their first ever Champions League goal after taking a shock lead at PSV!
Their first Champions League goal came from the penalty spot, and Promise David made no mistake to give the visitors a dream start.
18:46 CET - We are underway in Bilbao after a short delay. Vamos!
18:45 CET - It is five minutes until kick-off in Bilbao, which means only one thing. It is time for the Champions League theme song as the players walk out.
The Champions League is back, ladies and gents.
18:15 CET - As we approach 30 minutes until kick-off, Opta has some interesting insight about Arsenal's lineup.
Opta insight: Arsenal are the first non-Spanish team to name four Spaniards in their starting XI for a UEFA Champions League game against Spanish opposition (Raya, Mosquera, Merino, Zubimendi) since Chelsea vs Barcelona in February 2018 (Alonso, Azpilicueta, Pedro, Fabregas).
17:25 CET - The first team news is in for the 2025/26 Champions League campaign!
The hosts, Athletic Bilbao, make two changes from the side that lost 1-0 at home to Alaves at the weekend, with Maroan Sannadi leading the line after coming on at the hour mark on Saturday.
Talisman Nico Williams remains out injured, which is a setback, but one they would have prepared for in training this week.
The visitors Arsenal hand Champions League debuts to new signings Noni Madueke and Eberechi Eze, whilst striker Viktor Gyokeres makes his first Champions League appearance for the Gunners, having previously starred for Sporting.
Check out the full team news below:
16:30 CET - Hello and welcome to our live coverage of the first week of the UEFA Champions League for 2025/26. Today, the league phase of Europe's premier competition begins with six matches, followed by six more tomorrow and a further six on Thursday.
There's plenty to enjoy this evening with Arsenal and PSV in early action from 18:45 CET, and Real Madrid, Tottenham and Juventus all paying from 21:00 CET.
Check out all of today's matches and follow the Champions League live here!
Matchday 1 is the only week of the league phase in which there are three days of fixtures. From Matchday 2, the competition returns to its traditional times on Tuesdays and Wednesdays. The final Matchday is all played simultaneously on one day.
Want to know more about this season's edition of the Champions League? You can find all you need to know here!
Read about the best matches this week in our European Highlights.
Follow your favourite players tonight!
The Champions League is back, but that's not all that's new... On Flashscore, we are excited to be rolling out a brand new feature. You can now follow players in our app, just like you follow teams.
Curious to see how it works? Watch the video below or read more about our new feature here, and give it a go ahead of the matches tonight!